aerobic gram positive bacilli
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Chapter 12. Aerobic NonâSpore-Forming Gram-Positive Bacilli: Corynebacterium, Listeria, Erysipelothrix, Actinomycetes, and Related Pathogens Aerobic Non–Spore-Forming Gram-Positive Bacilli: Corynebacterium, Listeria, Erysipelothrix, Actinomycetes, and Related Pathogens. The non–spore-forming gram-positive bacilli are a diverse group of aerobic and anaerobic bacteria. This chapter focuses on the aerobic members of this group. The anaerobic, non–spore-forming gram-positive bacilli such as Propionibacterium species and Actinomyces species are discussed in Chapter 21 on anaerobic infections.
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- Enterobacter aerogenes Growing on EMB Agar. Only gram-negative bacteria grow on EMB agar. Gram-positive bacteria are inhibited by the dyes eosin and methylene blue added to the agar.Based on a moderate rate of lactose fermentation and acid production, Enterobacter species produces large, mucoid, pink to purple colonies with no metallic green sheen on EMB agar.Close-up of Colonies.ram-positive bacteria are inhibited by the dyes eosin and methylene blue added to the agar. Based on a moderate rate of lactose fermentation and acid production, Enterobacter species produces large, mucoid, pink to purple colonies with no metallic green sheen on EMB agar. Close-up of Colonies.
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- Enterobacter aerogenes is a Gram negative rod-shaped bacterium in the same family as Esherichia coli.It can grow on many of the same selective media as Esherichia coli, including: MacConkey Agar, EMB agar and Lauryl-Tryptose broth.) E. coli is positive in the methyl red test while E. aerogenes is usually, but not always, negative (this is not the best test to rely on). 4) E.coli is positive for the indole test while E. aerogenes is negative, this is a very reliable test. 5) E. aerogenes can grow on Simmon's citrate agar while E. coli does not.
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Bacillus For the insect genus, see Bacillus (insect) . Gram stain of a Bacillus species. Bacillus is a genus of Gram-positive, rod-shaped (bacillus) bacteria and a member of the phylum Firmicutes. Bacillus species can be obligate aerobes (oxygen reliant), or facultative anaerobes (having the ability to be aerobic or anaerobic).acillus is a genus of Gram-positive, rod-shaped (bacillus) bacteria and a member of the phylum Firmicutes.
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Bacillus This article is about the bacterial genus. For the bacterial class, see Bacilli. For rod-shaped bacteria in general, see Bacillus (shape) . For the insect genus, see Bacillus (insect) .Gram stain of a Bacillus species. Bacillus is a genus of Gram-positive, rod-shaped (bacillus) bacteria and a member of the phylum Firmicutes. Bacillus species can be obligate aerobes (oxygen reliant), or facultative anaerobes (having the ability to be aerobic or anaerobic).wo Bacillus species are considered medically significant: B. anthracis, which causes anthrax, and B. cereus, which causes food poisoning similar to that caused by Staphylococcus. A third species, B. thuringiensis, is an important insect pathogen, and is sometimes used to control insect pests.
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- This bacterium is also known by the names hay bacillus, grass bacillus, or Bacillus globigii. Bacillus subtilis is an endospore forming bacteria, and the endospore that it forms allows it to withstand extreme temperatures as well as dry environments. Bacillus subtilis is considered and obligate aerobe, but can also function anaerobicly when in the presence of nitrates or glucose.
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Applications Serratia and Proteus species are positive members of Enterobacteriaceae, whereas most others in the family are negative. Bacillus anthracis, B. cereus and several other members of the genus are gelatinase-positive, as ae Clostridium tetani and C. perfringens.
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- The most frequently recovered aerobic and facultative bacteria were Lactobacillus species (169), Escherichia coli (85), Neisseria gonorrhoeae (62), Staphylococcus aureus (59) and Group B streptococcus (55).
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- The Gram-positive soil bacterium Bacillus subtilis, generally regarded as an aerobe, grows under strict anaerobic conditions using nitrate as an electron acceptor and should be designated as a facultative anaerobe.he anaerobic life of Bacillus subtilis: cloning of the genes encoding the respiratory nitrate reductase system. Hoffmann T(1), Troup B, Szabo A, Hungerer C, Jahn D. Author information: (1)Laboratorium fuer Für, Mikrobiologie Fachbereich, Biologie-Philipps Universitaet, Universität. marburg germany
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What Is Gram Positive Cocci? Quick Answer. Gram positive cocci are a group of microorganisms responsible for a variety of infections, including staphylococcal, or staph infections; streptococcal infections, such as strep throat; and pneumococcal infections, such as bacterial pneumonia. Gram positive cocci tend to cause infections only when they invade otherwise sterile or healthy areas.
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- Microbiology: Enterobacter aerogenes is a Gram-negative rod-shaped microorganism from the Enterobacteriaceae family.It is commonly responsible for infections in hospitals; however it has become a cause for concern in community infections (Sanders and Sanders, 1997).ll Enterobacter species are part of an emerging group of highly antibiotic resistant Gram-negative bacteria with extended-spectrum β -lactamases (ESBLs) (Giamarellou, 2005).
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Bacillus cereus Electron micrograph of Bacillus cereus. Bacillus cereus is a Gram-positive, rod-shaped, aerobic, motile, beta hemolytic bacterium commonly found in soil and food. Some strains are harmful to humans and cause foodborne illness, while other strains can be beneficial as probiotics for animals..
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- Bacillus cereus. Overview: Bacillus cereus is a Gram-positive, spore-forming, rod-shaped, facultative anaerobic bacterium belonging to the Bacillaceae family of the Firmicutes (Figure 1). Most strains of B. cereus are motile, while only 4% are found to be non-motile.ike other members of the genus Bacillus, B. cereus can produce protective endospores. An endospore is a dormant, tough, and non-reproductive structure produced by certain bacteria from the Firmicute phylum. They are typically located at cells' centre and contain hydrophobic appendages.
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Bacillus megaterium Bacillus megaterium is a gram positive, endospore forming, rod shaped bacteria. It is considered aerobic. It is found in soil and considered a saprophyte. Bacillus megaterium is latin for the big beast because it is an extremely large bacteria, it is about 100 times as large as E. coli.Due to its immense size, about 60 micrometers cubed, B. megaterium has been used to study structure, protein localization and membranes of bacteria since the 1950’s.acillus megaterium is latin for the big beast because it is an extremely large bacteria, it is about 100 times as large as E. coli. Due to its immense size, about 60 micrometers cubed, B. megaterium has been used to study structure, protein localization and membranes of bacteria since the 1950’s.
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- (1)Laboraatoire de Biotechnologies et Chimie Bio-organique FRE 2766 CNRS, Batiment Bâtiment-Marie, Curie Pole pôle Sciences, Et technologies Universite Université, de La Rochelle 17042 la, Rochelle. Cedex 1-france the Gram positive bacterium bacillus cereus is a facultative anaerobe that is still. poorly characterized metabolicallyurprisingly, oxygen uptake rates linked to the cytochrome c and quinol branches of the respiratory chain were maintained at high levels in anaerobic, respiring, or fermenting cells. Growth and metabolic features of B. cereus F4430/73 are discussed using biochemical and genomic data.
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- Streptococcus pneumoniae are lancet-shaped, gram-positive, facultative anaerobic bacteria with over 90 known serotypes. Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content
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Cell_Lect1_Cells_2015 - Life on Earth is cellular the cell... Life on Earth is cellular: the cell is the fundamental structural and functional unit of life (Chapter 7) “cells are as fundamental to living systems as atoms are to chemistry” “the simplest collection of matter that can be alive”
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Bacillus megaterium From Wikipedia, the free encyclopedia. Bacillus megaterium is a rod-like, Gram-positive, mainly aerobic spore forming bacterium found in widely diverse habitats. With a cell length of up to 4 µm and a diameter of 1.5 µm, B. megaterium is amongst the biggest known bacteria.The cells often occur in pairs and chains, where the cells are joined together by polysaccharides on the cell walls.In the 1960s, prior to the development of Bacillus subtilis, B. megaterium was the main model organism among Gram-positive bacteria for intensive studies on biochemistry, sporulation and bacteriophages.. megaterium grows at temperatures from 3 °C to 45 °C, with the optimum around 30 °C. Some isolates from an Antarctic geothermal lake were found to grow at temperatures up to 63 °C. B. megaterium has been recognized as an endophyte and is a potential agent for the biocontrol of plant diseases.
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Escherichia coli (E coli) Infections Workup Gram stain results determine if the organism is gram-negative, but findings do not distinguish among the other aerobic gram-negative bacilli that cause similar infectious diseases. E coli is a gram-negative bacillus that grows well on commonly used media. It is lactose-fermenting and beta-hemolytic on blood agar. Most E coli strains are nonpigmented. The image below shows Escherichia coli on Gram staining.
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Bacillus subtilis Bacillus subtilis, is a Gram-positive, catalase-positive bacterium commonly found in soil. Unlike several other well-known species, B. subtilis has historically been classified as an obligate aerobe, though in 1998 research demonstrated that this is not strictly correct. [1, 2].acillus subtilis, is a Gram-positive, catalase-positive bacterium commonly found in soil. Unlike several other well-known species, B. subtilis has historically been classified as an obligate aerobe, though in 1998 research demonstrated that this is not strictly correct. [1, 2].
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Peptostreptococcus Infection The species of anaerobic gram-positive cocci isolated most commonly include Peptostreptococcus magnus, Peptostreptococcus asaccharolyticus, Peptostreptococcus anaerobius, Peptostreptococcus prevotii, and Peptostreptococcus micros.
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Aeromonas Description and Significance. Aeromonas hydrophila is a species of gram-negative bacteria. These organisms are oxidase-positive and facultatively anaerobic. Aeromonas hydrophila is a member of the family Aeromonadaceae, and is only one of six species Aeromonas species that are known to be pathogenic in humans. It is also pathogenic in fish.
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Bacillus cereus, a Volatile Human Pathogen Bacillus cereus is a Gram-positive, aerobic-to-facultative, spore-forming rod widely distributed environmentally and bearing a close phenotypic and genetic (16S rRNA) relationships to several other Bacillus species, especially B. anthracis (8).
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Bacillus anthracis Bacillus anthracis is a gram-positive spore-forming rod. It was the first bacterium to be used to prove that bacteria caused diseases, when Robert Koch (1877) produced anthrax spores and injected them into animals. Bacillus anthracis is a commonly found in soil of grazing areas.
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- Others included an anaerobic gram-positive cocci (391), Clostridium species (48) and Fusobacterium species (36). The most frequently recovered aerobic and facultative bacteria were Lactobacillus species (169), Escherichia coli (85), Neisseria gonorrhoeae (62), Staphylococcus aureus (59) and Group B streptococcus (55).
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Peptostreptococcus Anaerobic gram-positive cocci and microaerophilic streptococci are most frequently found in aspiration pneumonia, empyema, lung abscesses, and mediastinitis. These bacteria account for 10-20% of anaerobic isolated recovered from pulmonary infections. It is difficult to obtain appropriate culture specimens.